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Credit: Getty Images

EDINBURGH, SCOTLAND - FEBRUARY 20: Yang Guang feeds on bamboo as he bulks up for the breeding season with partner Tian Tian on February 20, 2013 in Edinburgh, Scotland. Experts at Edinburgh Zoo have announced they expect the giant panda breeding season may be earlier this year, as both Tian Tian (Sweetie) and Yang Guang (Sunshine) have already started to show important changes in their behavior that indicate that they will soon be ready to mate, speculating in four weeks time. (Photo by Jeff J Mitchell/Getty Images)